Investigation of acoustic emission in tissue deformation

Following amputation there is a risk of deep tissue injury when mobilising with a prosthesis which occurs due to dynamic deformation of soft tissue between the skeleton and the prosthetic socket. Current detection methods are invasive, cumbersome and do not provide real-time information. If shear stress is considered then it can ultimately be defined as fibres being pulled apart such as a fabric being torn. As such an acoustic noise maybe emitted and potentially quantifiable in real-time. The aim is to conduct exploratory experiments determining whether acoustic emission during tissue deformation is detectable for future influence of socket design. Animal tissue were prepared from two pork psoas major muscles into transverse and longitudinal specimens. A series of pilot studies were performed applying uniaxial displacement controlled tensile loads at a rate of 1mm/s using a Bose testing machine. These loads applied either 7mm or 9mm maximum displacement on differing specimen lengths to explore the optimum protocol. Specimens were submerged in either a temperature controlled or non-controlled water bath. Simultaneous acoustic recording took place using a hydrophone and digital oscilloscope along with stress and strain data from the Bose machine. Only the transverse specimens fractured and a signal seemed present on the oscilloscope display but due to Bose machine noise no quantifiable frequencies were discovered. Longitudinal specimens required more displacement than feasible to fracture. In conclusion these results are unable to determine if acoustic emission are detectable during tissue deformation. To provide more conclusive evidence either more sensitive, quieter instruments needs development or larger specimens with greater displacement are required.

Name dc:type.qualificationname

msc

Level dc:type.qualificationlevel

masters-pg

Grantor dc:publisher.institution

University of Strathclyde

Year dc:date.issued

2015

Author dc:creator

• Law, Jason

DOI

10.48730/fgpp-e836

Identifier

T14227

Author Identifier

201492893

OAI identifier oai:identifier

oai:strathclyde:0k225b067